WATCH: At least three people died and more than 140 were said to be injured -- some of them critically -- after twin blasts seconds apart near the finish line of the Boston Marathon on April 15. (AP video)

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World Leaders Condemn Boston Bomb Attack

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World leaders are condemning the deadly bombings at the annual Boston Marathon in Massachusetts.

UN Secretary-General Ban Ki-moon called the twin explosions at the race's finish line “all the more appalling for taking place at an event renowned for bringing people together from around the world.”

Boston Marathon Blasts Kill Three, Injure Over 140

At least three people have died and more than 140 are said to be injured -- some of them critically -- after twin bomb blasts 13 seconds apart near the finish line of the Boston Marathon. No suspects are in custody, and there has not yet been any claim of responsibility. In a brief statement to reporters at the White House, President Barack Obama pledged to find the perpetrators and bring the "full weight of justice” against them. Some 23,000 runners from dozens of countries took part in the 42-kilometer race, which is considered to be the world’s oldest annual marathon. (11 PHOTOS)

In a brief statement to reporters at the White House, Obama pledged to find the perpetrators and bring the "full weight of justice” against them.

“We’re still in the investigation stage at this point, but I just want to reiterate: We will find out who did this and we will hold them accountable," Obama said.

Obama said he had ordered that the full resources of the federal government be made available to aid victims and assist in the investigation.

The Federal Aviation Administration imposed a no-fly zone over the site of the explosions, while security was increased in New York City, Washington, Los Angeles, San Francisco, and other cities in response to the Boston bombs.

Some reports said at least one unexploded suspected device had been found in Boston and was dismantled by experts.

Some 23,000 runners from dozens of countries took part in the 42-kilometer race, which is considered the world’s oldest annual marathon.